Kelly Osbourne isn't letting a bad ankle sprain wreck her mood or derail her body goals. Follow her lead and stay fit even when the gym is out of the question.

I'm not a good injured person. After I hurt my ankle recently (short version: I fell down in a ladies' room), I was so annoyed, and not just because of the pain. What's frustrating is not being able to do what I normally do. I can't wake up and go for my usual run. Walking up the stairs or even getting dressed is a nightmare. But after a few days of feeling sorry for myself on the couch, I gave myself a reality check. I have a lot to be grateful for, and when it comes to my health and fitness, I don't have to play the victim card.

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Kelly's tips…Gym-free ways to lose weight

Living on life's terms means there will be times we don't feel well, when family obligations take priority, or when we're exhausted. Take it from me: These tips can help you maintain your weight.

1. Look at food as fuel, not comfort. Ads say, "Here's this yummy, delicious whatever. It'll make you so happy!" But no, it won't, not when I wake up tomorrow and I'm three pounds heavier. I don't believe in deprivation, but since I'm not burning as many calories, I'm watching portions and not eating white carbs—so no bread, chips, potatoes.

2. Don't drink your calories. My general rule: If I can't see through it, I don't drink it. Sometimes I like the sweetness of juice or Sprite. But for now, I've cut out everything but water. I'd rather eat my calories.

3. Beware "healthy" foods that aren't. Just because it says fat-free doesn't mean it won't make you gain. Look at the ingredients: Sugar turns into fat!

4. Wait a minute—actually, wait 20. It takes some time after you've eaten for your brain to get the message that you're full. When you're sedentary, you need to pause during meals and let your brain catch up. You've probably eaten enough.

5. Figure out what you can do. Trust me, you can work out even if you can't leave the house—you'd be amazed at how effective it is to use water bottles as weights! With a hurt ankle, I had to incorporate exercises into my routine that didn't require any weight on my feet. A lot of work can be done on your knees and back (yes, I'm aware of how inappropriate that sounds!), which forces you to focus on your core—always a good thing. Look up Pilates and yoga exercises online (there are so many great resources, like redbookmag.com/homemoves) and do them while you watch—I can't resist—Fashion Police!

6. Hang in there. The basic lesson is, when life throws something tough at you, don't let it be an excuse to not take care of yourself. Let it be a reminder that you need to focus even more on you.